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LMDB 1.0 is a high-performance, transactional key-value store database library with ACID semantics, memory-mapped storage, and full thread/process safety. The new version includes upgrades from 0.9 and continues to offer a simple, robust embedded database solution.
Noxu DB is an embedded transactional key-value database engine written in Rust, ported from Berkeley DB Java Edition, offering ACID transactions, B+tree storage, crash recovery, and optional replication.
FractalBits introduces a specialized single-node KV storage engine that eliminates fsync calls to achieve significantly higher write throughput on NVMe SSDs by managing durability directly at the hardware level.